Enviromental Science unit conversion

Enviromental Science unit conversion
1. (a) If the concentration of toluene vapor in a polluted air is 92 ppm, how would thatnumberchange if we raise the temperature by 10 oC? If the concentration of toluene vapor is 92?g/Lhow would the number change if we raise the temperature by 10 oC (at a constant pressureof 1 atm)? (1pt)

(b) How much (in mg) lead (Pb) and cadmium (Cd) are in 1 kg of contaminated soil iftheconcentrations of Pb and Cd are 350 ppb and 5.6 ?g/g, respectively? (1pt)

(c) The average surface temperature of the earth is about 15 oC. Convert that to oF, oK,and
oR. (1pt)
(d) If the concentration of tetrachloroethylene (C2Cl4, a chlorinated solvent) in anindustrialwastewater is 332 ?g/L how many ?mol of C2Cl4 is in a gallon of wastewater? (1pt)

(e) A water contains 90 ppb nitric oxide (NO). Express the concentration in ?M. (1pt)
(f) A gas contains 90 ppb NO. Express the concentration in ?g/L at STP. (1pt)
(g) A combustion exhaust contains 90 ppb NO. Express the concentration of NO in ?g/Lifthe exhaust is at 11.76 psia and 572 oF. (1pt)

(h) The National Ambient Air Quality Standard for ozone (O3) is 0.075 ppm. Thatstandard
3

corresponds to how many O3 molecules in 1m

of air at STP? (1pt)

(i) A chemist reports that the combined concentration of nitrate(NO3

—) plus nitrite(NO

—)in

a groundwater sample from an agricultural site is 0.85 mM. What is the sum of [NO3-N]and[NO2-N] in this groundwater (in ppm)? (1pt)

(j) The table shows a typicalchemicalanalysis of a natural water. What isthehardness of this water, in mg/LCaCO3?(1pt)
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